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Investments (Tables) - Available-for-Sale Debt Securities
 6 Months Ended
Jun. 30, 2021
Investments  
Schedule of available-for-sale debt securities
Available-for-sale debt securities are recorded at fair value, with unrealized gains and losses included as a component of accumulated other comprehensive loss in stockholders’ equity, until realized. Available-for-sale debt securities consisted of the following (in millions):
As of June 30, 2021Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
U.S. government and agency securities$1,901.2 $5.5 $(0.7)$1,906.0 
Corporate debt securities378.0 1.9 (0.2)379.7 
Total$2,279.2 $7.4 $(0.9)$2,285.7 
Reported under the following captions on our consolidated balance sheets:
Current marketable investments  $960.3 
Non-current marketable investments  1,325.4 
Total  $2,285.7 
As of December 31, 2020Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
U.S. government and agency securities$1,902.4 $9.8 $(0.1)$1,912.1 
Corporate debt securities331.2 3.2 — 334.4 
Total$2,233.6 $13.0 $(0.1)$2,246.5 
Reported under the following captions on our consolidated balance sheets:
Cash and cash equivalents$79.0 
Current marketable investments  1,017.9 
Non-current marketable investments  1,149.6 
Total  $2,246.5 
Summary of the contractual maturities
The following table summarizes the contractual maturities of available-for-sale debt securities (in millions). Actual maturities may differ from contractual maturities because the issuers of certain of these debt securities have the right to call the securities or prepay their obligations under the securities with or without penalties.
 As of June 30, 2021
 Amortized CostFair Value
Due within one year$956.5 $960.3 
Due in one to three years1,322.7 1,325.4 
Total$2,279.2 $2,285.7